// Catalano Neuro Library
// The Catalano Framework
//
// Copyright © Diego Catalano, 2013
// diego.catalano at live.com
//
// Copyright © Andrew Kirillov, 2007-2008
// andrew.kirillov at gmail.com
//
//    This library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Lesser General Public
//    License as published by the Free Software Foundation; either
//    version 2.1 of the License, or (at your option) any later version.
//
//    This library is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//    Lesser General Public License for more details.
//
//    You should have received a copy of the GNU Lesser General Public
//    License along with this library; if not, write to the Free Software
//    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//

package Catalano.Neuro;

/**
 * Distance neuron.
 * @author Diego
 */
public class DistanceNeuron extends Neuron{

    /**
     * Initializes a new instance of the DistanceNeuron class.
     * @param inputs Neuron's inputs count.
     */
    public DistanceNeuron(int inputs) {
        super(inputs);
    }

    @Override
    public double Compute(double[] input) {
        // check for corrent input vector
        if ( input.length != inputsCount ){
            try {
                throw new Exception( "Wrong length of the input vector." );
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        // difference value
        double dif = 0.0;

        // compute distance between inputs and weights
        for ( int i = 0; i < inputsCount; i++ )
        {
            dif += Math.abs( weights[i] - input[i] );
        }

        // assign output property as well (works correctly for single threaded usage)
        this.output = dif;

        return dif;
    }
}